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The interference prediction model is a major tool in the effort to obtain electromagnetic compatibility in the crowded radio frequency spectrum. Work has progressed in the prediction modeling of the transmitter, antenna, propagation, and receiver, but additional expressions for the degrading effect of interference upon information output to the operator are required to complete the analysis. The paper introduces an analytical approach to obtaining a quantitative prediction of the interference degradation to a radar PPI display. Determining the signal output from the receiving system due to environment has been accomplished by various approaches and is reported on elsewhere. For the purposes of this investigation, a description of the receiver output in terms of the pulse density distribution by received power level is assumed. The task remaining and the subject of the study performed, is the relationship between the pulse signal distribution input to the display and the resulting interference to the PPI.